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* Fixes #3959 There are two bugs racing each other here, which is why it sometimes crashes and sometimes the app just silently exists Bug 1 When the window is recreated a Destroyed event arrives (due to the Drop of the old window). The code that receives this event does not look to see if its the main viewport or a secondary one and unconditionally closes the app. The code path for other platforms is slightly different and does check. I have moved the code that handles the destroy to be in the same place and have the same behavior as the other platforms. Bug 2 At recreate time the window and winit entries of the viewport are set to None (forcin g them to be recreated). But the surface is still bound to the old window, this causes the next context switch to fail. So I simply added a viewport.gl_surface = None too, This is my first egui PR so I hope I have not broken anything. If nothing else I understand a little better how egui works.